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Dual Diameter Sizer, type -H
Dual Diameter Sizer, type -H Quantity in Basket: None
Catalog No.: DDS-1-H
Price: $430.00
Shipping Weight: 1.50 pounds
Enter major diameter:
Enter minor diameter:
Select Ogive (nose) Shape:
Truncated Cone (TC)
1/2-E Blunt RN
3/4-E Pistol RN
1-E Rifle RN
1-E standard flat tip (50% of caliber)
Luger 9mm shape
2-S Short Spitzer
4-S Short Spitzer
6-S Standard Rifle
8-S Spitzer
10-S Spitzer
12-S spitzer
Ultra Low Drag Secant
Custom Shape (+ $240)
Enter custom ogive specs:
Select base shape (if applicable):
Not applicable
Flat base
Dish base (shallow concave)
Cup base (paper patch)
Hollow base (typically for pellet, Minie-ball, airgun slug)
Rebated Boatail
Base Guard
Heel Base (enter specs) +$84
Custom Base (enter specs) +$84
Enter custom base specs:
Enter which part of bullet is reduced:
Base (heel base)
Nose (bore rider)
The Dual Diameter Sizer die looks like a core seater but it has two internal diameters, usually the difference between the rifling diameter (distance from groove to groove across the bore) and the bore diameter (which would be the distance across the lands from one side to the other of the bore). In most modern guns this is .008 inches, allowing for rifling depth of .004 inches.

The purpose of the die is to reduce part of a finished bullet diameter, usually the nose, so that it fits on top of the rifling and does not engage it. The distance you push the bullet into the die controls how long of a section is reduced to this "minor" diameter.

The rest of the bullet is left the same size, so you specify the DDS-1-H with two numbers: the caliber is the major diameter, and it is the same as the caliber of the point forming die used to make that bullet. The reduced section is specified as a minor diameter. The length of the reduced section is up to you, but you should allow a "driving band" to remain at full diameter, probably about a caliber length but certainly as much as you will be seating into the neck of the cartridge.

Dual Diameter Sizer dies have two other specifications. The base punch, which is the external one, must match the shape of the bullet base. There probably will not be enough force involved to reshape the base in this step, so it is best to match the bullet base and punch shape rather than attempting to change it here.

The other specification is the nose shape. This is important, as the force required to push the bullet back out of the die, after sizing it down so much, is enough to deform the nose unless you use the same shape of cavity in the internal punch as the original bullet nose.

However, one small advantage is that if you intend to make a lead tipped dual diameter bullet, you can do away with the lead tip forming die. The pressure of pushing the drawn bullet back out of the die is enough to also re- shape the lead tip, so it does not have to be preformed in any way. It just needs to be large enough to fill in the volume required and not leave a void at the tip. Surplus lead which projects from the bullet tip will probably be smoothed into a thin film that lays on top of the bullet nose, and can be peeled off with a fingernail. Once you find the proper amount of projecting lead tip, you will have neither a void nor any film of lead pushed over the jacket.

DDS-1-H dies have also been used to form a heel base, by designing the punches so that you push the bullet backward into the die and reduce the rear portion. This means the external punch would be shaped to support the nose of the bullet, and the internal punch would match the base shape (usually flat, but could be cup or hollow).

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